Incredible plants: tiger lilies

Lilium columbianum, near Comet Falls, Mt. Rainier
National Park, July 2016.

Lilies are a stunning group of flowering plants, and many members of that family have a strong aesthetic appeal for me. The Liliaceae are monocots, thus the flower parts occur in multiples of three. A prototypical lily flower would have six petals, six stamens, and a single style protruding from the center of the flower. Several lilies such as some members of Calochortus and Lilium have a curved perianth (petals), so that the overall shape of the flower is like an orb.

“Tiger lily” is an informal common name which has been applied to a few species in the genus Lilium that have orange spotted petals. These include Lilium columbianum (the “small-flowered tiger lily”), two subspecies of L. paradalinum (“Vollmer’s tiger lily” and “Wiggins’ lily”), and L.parvum (“Sierra tiger lily”) (Turner and Gustafson 2006; Skinner 2016). Other similar species in the Pacific states include L. bolanderi and L.occidentale, each with reddish spotted petals. 

Characteristics and distribution of five "tiger lily" species in the Pacific states.
References: Turner and Gustafson (2006), Baldwin et al. (2012), Wenk (2015).

Shoots of these lilies are typically 1-3 meters in height, green (non-woody), and have whorls of leaves emerging from the stem at regular intervals. The flowers of some species including L. columbianum and L. paradalinum hang pendant, a humble posture unnecessary for such a glorious flower.

Lilium pardalinum. Left: Ventana Wilderness, Los Padres National Forest, Big
Sur, CA, 2009. Right: Sucker Creek, Siskiyou National Forest, southern OR, July 2016.

Of the five species listed here, L. columbianum is most common, being distributed from British Columbia to northern California (Turner and Gustafson 2006). L. pardalinum occurs in California and southwest Oregon, while L. bolanderi and L. occidentale inhabit the Klamath mountains area in northwest CA and southwest OR (Turner and Gustafson 2002, Baldwin et al. 2012). L. parvum inhabits wetland or riparian areas at higher elevations in the Sierra range (Baldwin et al. 2012).

Lilium parvum, Tahoe National Forest, Sierra Nevada range,
CA, July 2009.

While visiting Oregon Caves National Monument earlier this summer, we camped along Sucker Creek, a quiet beautiful location where the shallow stream ran swiftly among rocks, close to the campsite. Riparian corridors seem to be excellent locations to find tiger lilies and I spotted some flowers along the far bank of the river. I crossed over to photograph them. The first flowers were somewhat on their way out, but farther upstream I found a cluster of several plants at the edge of the river near a rocky outcrop of serpentine, each bearing several flowers in their prime.

The green hues of serpentine rock and beautiful blooming lilies were exciting enough, but suddenly I also noticed a beautiful swallowtail butterfly visiting the flowers too. It was photographic bliss to have two such bright and magnificent organisms in the same place. The swallowtail was mostly undeterred by my close presence and spent some time visiting a few different flowers. It landed on the underside of each flower and then rhythmically bowed to the flower, each time inserting its long black proboscis deep into the flower to extract nectar.

Lilium pardalinum and a beautiful swallowtail visitor at Sucker
Creek, Siskiyou National Forest, southern OR, July 2016.

References

Baldwin BG et al. 2012. The Jepson Manual. Vascular Plants of California. 2^nd ed. University of California Press, Berkeley, CA.

Skinner MW. 2016. Lilium parvum, in Jepson Flora Project (eds.) Jepson eFora, http://ucjeps.berkeley.edu

Turner M, Gustafson P. 2006. Wildflowers of the Pacific Northwest. Timber Press, Portland, OR.

US Geological Survey. 1996. Kerby Peak, OR. 1:24000 topographic map.

Wenk E. 2015. Wildflowers of the High Sierra and John Muir Trail. Wilderness Press, Birmingham, AL.